Conveyer pad



Aug. 4, 1931. c. L. MAT-rlsoN CONVEYER PAD Filed July- 9; 1926 mw uwPatented Aug. 4, 1931 f UNITED STATES PATENT OFFICE CARL MATTISON, FROCKFORD, ILLINOIS, ASSIGNOR T0 MATTISON MA- m WORKS, 0F ROCKFORD,ILLINOIS, A CORPORATION OF ILLINOIS CONVEYEB. PAD

Application led July 9, 1926. Serial No. 121,327.

the work-so that there is a minimum ofy lateral displacement eitherlongitudinally or transversely of the direction of travel of theconveyer. It is also desirableto provide the conveyer with a surfacewhich will 1g have a slight yielding action tending to force the workAinto engagement with the drums. Rubber, in various forms has been usedfor this purpose, but heretofore ditlicult has been encountered inproviding a' ,n sur ace of rubber which would serve the purpose and atthe same time would vnot entail great expense in replacement or reair ifthe surface became torn or damaged.

It is the general object of this invention to z5 provide a new andimproved pad for a conveyer adapted to be one of a number of such padswhich constitute the surface of the conveyer and which may be readilyand easily replaced if dama ed.

3o `Another object of this invention `is to provide anim roved conveyerpad which may be manu actured at a low cost, is readily replaceable, andis eiiicient in operation.

85 Another object is to provide an improved surface for a conveyer whichcomprises a plurality of separate 'pads removably secured to the base ofthe conveyer.

' A further object is to roduce a conveyer in which the contact sur aceis com d of a plurality of right and left hand padspconstructed toprovide a definite pattern or tread.

Another Objectis to provide a conveyer '.5 pad which has a regular shapeso that the pads may be each other.

Another object is to produce a conveyer pad which has a resilientsurface formed to provide a series .of members which are adapted tocontact the work.

Other objects and advantages will be apparent from the followingdescription and the accompanying drawings, in which:

Fig. l is a fragmentary plan view of a I conveyer illustratingl theimproved form of the invention.

Fig. 2 is a vsection taken on the line 2 2 of Fig. 1.

Fig. Sis a section taken on the line 3-3 of Fig. 1.

Fig. 4 is an enlarged plan view of the preferred form of the invention.

5 is a section taken on the line 5--5 of Fig. 4.

While I have shown in the drawings and will hereinafter disclose indetail the preferred embodiment of the invention, it is contemplatedthat various changes in construction and arrangement may be madey bythose skilled in the art without departing from the spirit and scope ofthe invention Aas expressed in the appended claims.

' In the type of conveyer contemplated by this invention, a travelinorbed is adapted to receive a plurality of indlvidual pads which providethe bearing or contact surface of the conveyer. The travelin bedcomprises the usual pair of heavy end ess chains having links 10 to eachof which a cross bar 12 is secured, as by means of bolts 11. The chainmay be of any construction suitable to that particular type of machinein which the conveyer is to be used, while cross bars l2 are preferablyformed of sufficiently heavy steel to prevent any possibility of theirspringing intermediate the two chains.

The pad 13 in its preferred form (Figs. 4 and 5) comprises a suitablyheavy metal base 14 provided with a resilient surface 15 placed inabutting relation to on one side thereof. The flexible surface is usuallformed of rubber which is moulded on an vulcanized to the metal base 14.In order firmly to secure the rubber surface to the base 14a pluralityof openings 16 are provided in the base, said openings being countersunkfrom the under side of the base as lshown in Fig. 5.. Thus when therubber surface 15 is moulded on the base 14 the rubber will enter theopenings 16 and provide a wedge shaped foundation which uponvulcanization will resist any force tending to pull, tear or shear the,rubber surface from the base.

An important part of this invention is the form of the contact surfaceof' the pad and the pattern or tread which is formed by these pads whenthey are secured to the bars 12. The pad 13 is preferably in the form ofa parallelogram and the contact or bearing surface of each pad, aftermoulding, presents a series of alternating ridges 17 and grooves 18,said ridges and grooves running parall'el to one side of the pad. Eachpad is secured on the bar 12, as by means of headed bolts 19 threadedinto holes in the bars 20 through apertures in the rubber surface andcountersunk openings 21 in the base 14 of the pad, in such position thatthe ridges 17 and grooves 18 will be at an angle with the edges of thebars 12. v

Inasmuch as a transverse creeping motion would be imparted to the Workif the ridges 17 on every ad were to run in the same direction,- rig tand left hand pads have been provided.v That is to say, the pads aresimilar in eneral shape and contour but are reversely ormed so that ifthe backs of a right hand and a left hand pad are placed togetherthemargins of the pads w11l coincide. These right and left hand pads aresecured upon the alternating bars of the conveyer, that is, the righthand pads are fastened to every other bar and the left hand pads arerigid with the intervening bars. In this vmanner anirregular zig-zagtread is formed on the contact surface of the conve er.

t is, of course, obvious that the ridges may run in an unbroken line,but it has been found preferable to stagger the ridges and the wor whenthe pads are properly secured on the bars 12, the ends of the ridges 17on the pads on one bar will be o osite the grooves 18 on the pads on thea jacent bar. As the right and left hand pads are the same size theproper positioning of the pads on the bars to obtam'the' staggeredrelation is a simple matter of predetermining the position of the boltholes 20 in the bars 12. l

Due to the non-rectangular shape of the i padst13, spaces, each in theshape of a trapezoid, will be left at each end of the bars 12. Thesespaces may be covered by specially (grooves on adjacent bars., In otherAs shown plainlyin Figs. 2 and 3, it will be impossible for any metallicpart to'contact or bear against the work until after the tread has rbeenalmost entirely worn away. Injury to the work can thus be avoided, sincethe worn pads can be replaced before the tread is entirely Worn away.

Furthermore, a conveyer has beendevised which has a resilient bearingsurface Aand which, due to the design of the tread, will resist anytendency of the work to creep.

I claim as my invention:

1. A conveyer pad, comprising, in combination, a parallelogrammic basehaving a plurality of openings therein, a resilient surface on one sideof said base, having parts thereof entering said openings to anchor saidsurface on said base, and a plurality of ridges on said surface extendinsubstantially parallelto one side thereo 2. A conveyer having incombination, supporting means, similarly shaped but reversely formedreplaceable pads arranged on said supporting means to provide a surfacefor said conveyer, each of said pads comprising a base having aresilient surface, said surfaces having a plurality of ridges thereon atan angle to the direction of travel of said conveyer.

3. In a conveyer comprising, in combination, a traveling bed including aplurality of cross bars, a plurality of pads secured on each of saidcross bars and arranged to provide a continuous contact surface for saidconveyer, said surface of each of said pads being formed of a resilientmaterial having a plurality of ridges thereon extending at an angle tothe direction of travel of said conveyer, the angles of said ridges onlongitudinally adjacent pads being in oppo- Asurface including a seriesof ridges extending angularly thereacross, said right hand pads beingsecured to alternate bars and said' left hand pads being secured to theintermediate bars in such position that the ridges provide a zig-zagtread for the conveyor.

5. A conveyor having, in combination, a traveling bed including a,plurality of cross members, a plurality of pads secured to a1- ternatemembers, and a. plurality of similarv 5 but reversely shaped padssecured to the intermediate members, the surfaces of said pads beingformed with ridges, said pads being positioned on said bars so that theridges on one group of pads will be staggered in m relation to theridges on the group of pads on the adjacent bars.

In testimony whereof I have hereunto aiixed my signature.

CARL LAWRENCE MATTISON.

